package org.smile.homework01.kevin.Weapon;

public class Trace {           //追踪
    private static final Trace instance = new Trace();
    private Trace(){}

    public static Trace getInstance(){
        return instance;
    }

    public void begin(){
        System.out.println("武器开始追踪目标");
    }
    public void end(){
        System.out.println("武器追踪到目标");
    }
}
